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Screening for Disease. Guan Peng Department of Epidemiology School of Public Health, CMU. Learning Objectives. Definition of screening; Principles of Screening. What is Screening.

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screening for disease

Screening for Disease

Guan Peng

Department of Epidemiology

School of Public Health, CMU

learning objectives
Learning Objectives
  • Definition of screening;
  • Principles of Screening.
what is screening
What is Screening
  • Screeningis the testing of apparently healthy populations to identify previously undiagnosed diseases or people at high risk of developing a disease. 
  • Screening aims to detect early disease before it becomes symptomatic.
  • Screening is an important aspect of prevention, but not all diseases are suitable for screening. 
the principles of screening
The Principles of Screening
  • The choice of disease for which to screen;
  • The nature of the screening test or tests to be used;
  • The availability of a treatment for those found to have the disease;
  • The relative costs of the screening.
slide5
The disease must be an important health problem.
  • There should be a recognizable latent or early symptomatic stage.
  • The natural history of the disease, including latent to declared disease, should be adequately understood.
slide7
There should be a suitable test or examination.
  • The test should be acceptable to the population. 
slide9
There should be an acceptable treatment for the patients with recognized disease.
  • There should be facilities for diagnosis

and treatment should be available.

  • There should be an agreed policy on whom to treat as patients.
slide10
The cost of case finding (including diagnosis and treatment of patients diagnosed) should be economically balanced in relation to possible expenditure on medical care as a whole.
  • Case finding should be a continuing process and not a "once for all" project.
summary
Summary
  • Screeningis the testing of apparently healthy populations to identify previously undiagnosed diseases or people at high risk of developing a disease.
  • Principles of Screening: disease, test, treatment and cost.

What is the next step?

Define the validity of the screening test and

put screening to use in the population.